Summary
If you're working on React core and hit a test failure that only happens in the www channel or mysteriously skips in certain environments, this is your troubleshooting guide. It walks you through the fork file system (ReactFeatureFlags.js and its channel-specific variants), explains when to use @gate pragmas versus inline gate() checks, and covers the __VARIANT__ flag behavior that simulates gatekeeper testing. The debugging section on comparing flag states across channels is genuinely useful when you're staring at a CI failure that doesn't reproduce locally. One gotcha worth internalizing: feature flags need to exist in every fork file, not just the main one, which trips people up more than it should.
Install to Claude Code
npx -y skills add facebook/react --skill feature-flags --agent claude-codeInstalls into .claude/skills of the current project.
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Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
Start earning →Connect Claude to +800M contacts, +150M companies. Find & Enrich leads in chat.
Try For Free →Categories
